How do I remove a cache pool disk?   A few notes: -unRAID v6.4.1 or above required, upgrade first if still on an older release. -Always a good idea to backup anything important on the current cache in case something unexpected happens -You can only remove devices from redundant pools (raid1, raid5/6, raid10, etc) but make sure to only remove one device at a time, i.e., you can't remove 2 devices at the same time from any kind of pool, you can remove them one at a time af